GCN Circular 38063
Subject
EP241103a: Swift XRT detection and improved X-ray position
Event
Date
2024-11-03T16:13:41Z (a year ago)
Edited On
2024-11-04T13:14:20Z (a year ago)
From
P.G. Jonker at Radboud University <p.jonker@astro.ru.nl>
Edited By
Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov> on behalf of P.G. Jonker at Radboud University <p.jonker@astro.ru.nl>
Via
Web form
P.G. Jonker (Radboud Univ.), A. Martin-Carrillo (UCD), D.B. Malesani (DAWN/NBI & Radboud Univ.), J.A. Quirola-Vasquez (Radboud Univ.), A.J. Levan (Radboud Univ and Warwick Univ), F.E. Bauer (PUC), report for a larger collaboration:
We observed the field of EP241103a (Zhao et al., GCN 38051) with Swift/XRT starting on 2024-11-03 at 10:04:02 (UTC) for 984 seconds. We detect a faint X-ray source consistent with the improved Einstein Probe Follow-up X-ray Telescope position (Zhao et al., GCN 38058) at an enhanced position RA, Dec = 27.75834, 18.95698 (=01:51:02, +18:57:25.1) with an error radius of 4.6′′ (90% confidence) using the XRT UK build products website (Goad et al. 2007, A&A, 476, 1401; Evans et al. 2009, MNRAS, 397, 1177). An approximate X-ray flux of 4x10^-13 erg cm^-2 s^-1 (0.3-10 keV) was derived, implying a modest drop in source flux in the ~8.5 hours between the start times of the EP-FXT and the Swift/XRT observation (although still consistent at 1-sigma due to large uncertainty on both flux measurements).
We like to thank the Swift team for their rapid response in executing the observations.